3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN August 2006 ICS ; English Version Steel - Determination of yield strength increase by the effect of heat treatment [Bake-Hardening-Index] Aciers - Détermination de l'augmentation de la limite apparente d'élasticité due à un traitement thermique (index de durcissement à la cuisson [Bake-hardening]) Stahl - Bestimmung der Streckgrenzenerhöhung durch Wärmebehandlung (Bake-Hardening-Index) This European Standard was approved by CEN on 7 July CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10325:2006: E

5 EN 10325:2006 (E) Foreword This document (EN 10325:2006) has been prepared by Technical Committee ECISS/TC 1 Steel - Mechanical testing, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2007, and conflicting national standards shall be withdrawn at the latest by February According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. 3

6 EN 10325:2006 (E) 1 Scope This document specifies the method for the determination of yield strength increase by the effect of heat treatment (Bake-Hardening-Index) for steel. NOTE This test is applied in particular, to steels showing a mechanism of bake hardening, which are specially intended for automotive industry. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN :2001, Metallic materials Tensile testing Part 1: Method of test at ambient temperature 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN :2001 and the following apply. NOTE However it should be noted that in the context of this document, the term "yield strength" also covers 0,2 % proof strength in addition to its definition in EN Bake-Hardening-Index (BH 2 ) increase of yield strength between a reference condition after a 2 % plastic pre-strain and the condition obtained after a heat treatment simulating the usual industrial paint processes (see Figure 1) NOTE The heat treatment of simulation is specified in

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